(1) A vehicle is screened when the vehicle undergoes screening in accordance with regulations made under section 44:
(a) in preparation for being taken on board an aircraft; or
(b) in order to enter or remain in an area or zone within a security controlled airport.
(2) A vehicle receives clearance if:
(a) after being screened, the vehicle is allowed, by a screening officer, to pass through the screening point; or
(b) the vehicle passes through the screening point and the regulations provide, or the Secretary by written notice provides, that the vehicle may pass through that screening point without being screened; or
(c) the vehicle enters a cleared area, a cleared zone or a cleared aircraft other than through a screening point and the regulations provide, or the Secretary by written notice provides, that the vehicle may enter the area, zone or aircraft that way.
(3) A vehicle is cleared at a particular time if:
(a) the vehicle has received clearance; and
(b) since receiving clearance, the vehicle has at all times been in a cleared area, a cleared zone or a cleared aircraft.
(4) For the purposes of paragraph (3)(b), a vehicle is taken to be in a cleared area or cleared zone if the vehicle is under the supervision or control prescribed in the regulations.
(5) To avoid doubt:
(a) a notice under paragraph (2)(b) may provide that a class of vehicles may pass through a screening point without being screened; and
(b) a notice under paragraph (2)(c) may provide that a class of vehicles may enter a cleared area, a cleared zone or a cleared aircraft other than through a screening point.